Improve Android accessible hit testing.

content/browser/accessibility/browser_accessibility_android.h

Index: content/browser/accessibility/browser_accessibility_android.h
diff --git a/content/browser/accessibility/browser_accessibility_android.h b/content/browser/accessibility/browser_accessibility_android.h
index 09681c439324da6170ad5e8dc91e064313c37a0c..6942bb65644dbd4318f40d062631590bb4e892a2 100644
--- a/content/browser/accessibility/browser_accessibility_android.h
+++ b/content/browser/accessibility/browser_accessibility_android.h
@@ -48,6 +48,18 @@ class CONTENT_EXPORT BrowserAccessibilityAndroid : public BrowserAccessibility {
   bool IsSlider() const;
   bool IsVisibleToUser() const;
 
+  // This returns true for all nodes that we should navigate to.
+  // Nodes that have a generic role, no accessible name, and aren't
+  // focusable or clickable aren't interesting.
+  bool IsInterestingOnAndroid() const;
+
+  // If this node is interesting (IsInterestingOnAndroid() returns true),
+  // returns |this|. If not, it recursively checks all of the
+  // platform children of this node, and if just a single one is
+  // interesting, returns that one. If no descendants are interesting, or
+  // if more than one is interesting, returns nullptr.
+  const BrowserAccessibilityAndroid* GetSoleInterestingNodeFromSubtree() const;
+
   bool CanOpenPopup() const;
 
   bool HasFocusableChild() const;